Top bananas: shopping list survey reveals bananas are number 1 supermarket impulse buy

Statistical analysis reveals the extent to which we fail to follow our shopping lists

One of the few times you actually use a pen to write something down these days is just before a trip to the supermarket.

In order to understand how these rather charming, old-fashioned scribbles influence what actually makes it into our shopping baskets, Tesco data crunchers dunnhumby compared the shopping lists of 250 customers exiting six stores in and around London with what they actually bought.